Question 51

Find the wrong number in the given series. 

6, 12, 21, 36, 56, 81

Solution

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6, 12, 21, 36, 56, 81

$$12-6=6$$

$$21-12=9$$

$$36-21=15$$

$$56-36=20$$

$$81-56=25$$

so wrong term is first two it should be

$$11-6=5$$

$$21-11=10$$

so wrong term is 12

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